Casing for computer mainframe



FIG. 1 is a perspective view thereof

FIG. 2 is a right side elevational view thereof

FIG. 3 is a top side elevational view thereof

FIG. 4 is a front elevational view of a casing for computer mainframe showing new design

FIG. 5 is a bottom plan view thereof

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for a casing for computer mainframe, as shown and described. 